#include<stdio.h>
#include<math.h>
int main()
{
 	double a,b,c,disc,x1,x2,p,q;
 	scanf("%lf%lf%lf",&a,&b,&c);
 	disc=b*b-4*a*c;
 	if(disc<0)
 		printf("This equation hasn't real roots\n");
 	else
 	{
 		p=-b/(2.0*a);
 		q=sqrt(disc)/(2.0*a);
 		x1=p+q;x2=p-q;
 		printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);
	}
 	return 0;
}

